Assixetob



June 19, ,1928.

J R GAYMMETER TUBE AND METHOD OF MAKING `SAME Filed Aug. 5, 1925- Original Filed Aug- 5, 1925 @zy/en E ratus for o'rmmg tubes ioi... l l

" expense of. storage and o any suitable m ling means v ued .lune i9.

mimi; n. GAMMETEB.,

F NEW YRK. N. '"Z., 'Glle This uveniioii relaties to the kuba-makin? ml, and espeoiaily to 'the umnuiiczue simular )rubber tubes such as ixmc'l tubes im" tires. i

its chief objects ae economy o' labor und' impi'ovecl adhesion uw? u. laminated tube. l A more to provide imp'i'owd @foce .L ,L of cqupmentsuch iiueis handling the oaleudereii olnjoot is the provision oi impiovfeo. in a lougiudiuslly seumed. lumuubd nuue. Uf the uccompmijfing mwings Y. Figure 1 is n, peispeoive View oil u isili@ building drum embody/ing un@ sdopel to curry out my invention, Wilh inlio Woil iii, place thereon.

Fig. 2 is aside elevatiouo 'the sume? ai. :l later singe of operation, pa boing sew tionedjmd broken. away. Fig. 3 is :i section oli n. oi the :imm aud the wo'ilr. thereon ut i er stage.

Fiv. 4: u, sitio @loi/.1 ou ol" 'lle same ab a sti later stage o operation.

Referring* to the drawings, the appui-asus comprises a. di-uml@ adapted io 'be mounted im' rotation and having upon. its outer lisce an annular band li. of ilexililo.. elastic, vnounxlliesive material such as Vulouuosd publooc., this bami preferably being iformefl Wi u middle iib l2 on. its inner face, sely into groove ou the suiscs of the drum. so us lio maintain the bami propoly centeied. upon tim drum.

lIn the'pmcbioe of my method iu its pro- 'ei'red oif'm., :istrip 155 of culezuiieiel sinds; is drawn from u summe oi" si'iply such u calender und wound u 'um lie lrum il) 'over the bond 11, I'the Wiuiiiig giveu such helical formtlm the margius olf @zich Lum of the materiai slightly oiise't from lilies@ of the prevailing hun, Wifi?. he. imdmstood upon mieren-fle o i uml The sucoessiiremuvoiutous muy progressively com notati against otuejv dwing me muil iugperatiou and whenhe :lli is Lim-wu lumai March il?, ifi. No.

'reissue flied. .jpii i, 31.5325. Serial No. 269,376.

i Re. igg A PMENT osi-HCE.

EM? MAECNG 55mm.

fii, ilis August 3. '1935. Appieatidm for dii-sui@ from the @slender the Wurm ami moi condition of the rubber iresulhs in ulxesion of the piies.

been drawn outa 'the drum, the strip se'veed, us upon the' line lf3. of Fig. 1, omiily m, the same position oioumer omis. hf oi" the drum es that oi? ieudiu oud il?? oi* Wiiudirw. and. the residue 13 6D oi' stock strip is treed from the drum assembly. l

A 'wwe stem patch i5 is then mounted 'upon ills mmgin of the Wiucling el, which tue las' Wound ply ofzelmugs the umieiiying a5 plies, shown in Figs. 1 @mtl and the vulve siem hole i5* is punched in. the path through lle uricleilyiu* nulos stooltf: expose@ outer surface o' the winding, egmsp, the ma'igin 17 (Fig. fel) opposis lo which line 'valve stem pad is oi, as 1;e'"ef,l, with u wesh cousisvbiug o u uighly Y ile iisg coulauiuim: a suifsble sub s solution or suspension to prevent ow'upoiutes, which occurs quickly lneousu of warm ooudition of the stock when ibis drs-wu fiieoly *from the calender. Auui''.- ambie "Walsh for this purpose is u solution,

which muy be eci@ 'iu uivolioi. The Wash ieoiiiy muv ou applied by means-of a paint brush, 18, iiig. 2, heid against the work Whiie 'ibex drum 1s rotated.

After A iupou which the valve stem patch moui1ted,jis piogressively turuei over to uppiouiumtely the middle 'luie of tlm usselzuu olif, tog-ethos with the adjacent. margin, of the non-adhesive 'umierlyiug banni may be reauii4 y accomplished oy 'rotating-the drum und manipulating the said. lmargins with a suitable turning tooi, as will be rond iiyuuderstood by those skilled in 'the art.

The opposite margins of the band i1 and 95 of l'lie work are ,than similarly turned over anclftheume'fgins of the winding of the tacky rubber strip 13 are proglressively 'oned 'together in the mis-matches( intei'itte rela izou which is cieriy shown iu ,portion of the valve stem patch 15 jproiects fromjahe margini@ ojitotil'i'p vtlm issued uumbei of plies have 55 @but To ziou of 'the rubber when ie solvent 75 super-saturated oi stemric au soiwent has evaporated, the

11, which no Fig. 3. Thel stem preferably vent contact and adhesion of its inner surfaces,vand preferably in a mold, a valve vulcanization.

The method results in an improved longitudinally'seamed tube the several plies areA mismatched, and having the same number of plies at all parts of the tube. The employment of thev flexible band 11 permits the tacky rubber plies to be turned over and joined without the employment of other precaution against undesired adhesion thereof.

Modifications may be emplo ed within the scope of my invention and I do not wholly limit my claims to the specic description herein given by way of illustration. I claim:

1. The method of making an annular tube` which comprises helically Winding in a plu-4 rality of plies a continuous strip of tubelforming material to provide an annular structure with stepped margins, and joininU said margins to each other in interfitted relation.

2. The method of making a rubber tube which comprises forming a strip of .unvulcanized rubber with longitudinal mar ins of diminishing thickness toward the e ges of the strip, folding said margins over into overlapped relation to each other and joiningthem together, and l.vulcanizing the resu ting tubular structurel while holdin it distended against an enclosing mold by internal fluid pressure.

.3. The method of making an annular rubber tube which comprises winding a plurality of layers of tacky rubber stock onto a form with one layer offset from another, to provide stepped margins, folding the stepped being inserted prior to.the

of which the lseams ofV margins into contact, with each other .and joining them together in interlitted relation, with the two edge faces of each ply substantially abutting each other, and vulcanizing the resulting tube in a mold under internal fluid pressure.

4.' A tube comprising laterally oset layers of sheetimaterial, the margins of each layer being joined in 'a longitudinal butt sea-in, the seams of the layers being mismatched, and a plurality of the layers comprsinga Ycontinuous. Winding of material common to the said layers.

5. A method as dened in claim 2 in which the material of the structure'is fed into said structure in a continuous length from. the position at which it is given strip form.

6. The method of making a rubber tube which comprises forming a. strip ofunvucanized rubber in sheet form, folding over the side margins of the strip into contact with each other and joining them' in a seam while the rubber continues to be in an unvulcanized condition, and vulcanizing the resulting tubular structure while holding it distended against an enclosing mold by internal fluid pressure, the strip being formed by calendering and made into a tube before it cools to room temperature.

7. A tube comprising a plurality of superposed and directly united layers of rubber, the longitudinal margins of each layer being joined before vulcanizationin a butt-seam and coaleseed by vulcanization and the seams of the layers being mismatched.

8.. An endless tube comprising a plurality of superposed and directly united tubular layers of rubber, the longitudinal margins of Veach layer being joined before vulcanize- 

